InnerSpace 4.5-inch Replacement Sofa Mattress. Composed of 4.5-inch high density polyurethane foam. Includes a washable stretch-knit, cashmere blend zipper cover (cold water recommended). The mattress relieves soreness associated with pressure and distortion during sleep and eliminates motion transfer between bed partners. The 72L x 60W x 4.5H mattress can also be used for Sleeper Sofas. Like all InnerSpace mattresses, it ships compression rolled, making it easier to maneuver the mattress through tight spaces, such as stairwells and hallways. Simply move the mattress into position, remove the cover, and it will expand to its full and permanent size. Expands to 90% in 30 minutes and 100% within 48 hours. We are so confident you will love our high quality mattress that we offer a 30 Day Sleep Guarantee. If you decide to return the mattress in the first 30 days, there is an easy return method with no hidden restocking or return fees. Features our FlameWatch flame retardant technology. Manufacturer 10 Year Warranty. Proudly Made in USA. Sofa Not Included.